How to Wipe a Phone or Computer Before Selling or Donating It

An old phone or laptop is full of personal information: saved logins, photos, documents, messages, and account connections. Handing it over without a proper wipe can expose all of it. A factory reset is only the final step. Doing the steps in the right order keeps your data private and also avoids locking the next owner out.

Before you erase anything

Start with preparation, because it is hard to undo a wipe.

• Back up everything you want to keep, and confirm the backup works.
• Transfer your authenticator app accounts to your new device.
• Make a note of which services have your phone number or device saved as a trusted device.
• Remove any memory card or SIM card if the device uses them.

Step-by-step: wipe a phone

1. Sign out of your cloud account. On an iPhone, sign out of your Apple ID, which also turns off the activation lock. On Android, remove your Google account and any other accounts under settings.
2. Turn off device-finding features if they are not removed automatically with sign-out.
3. Unpair connected accessories such as smartwatches and wireless earbuds.
4. Open settings and find the reset or erase option, then choose to erase all content and settings, or factory data reset.
5. Enter your passcode or password when asked, and wait while the phone restarts and wipes.
6. Confirm the device lands on the first welcome screen, as it would out of the box.

Step-by-step: wipe a laptop or desktop

1. Sign out of services such as your cloud storage, music and video apps, and licensed software, and deauthorize the computer where required.
2. Sign out of your account and, on a Mac, turn off the device-finding feature.
3. Use the built-in reset tool. Windows offers a reset option that removes everything, and macOS offers an erase option in its system settings.
4. Choose the thorough option if asked whether to clean the drive, particularly for older hard disks.
5. Wait for the reinstall to finish and confirm the setup screen appears.

Why encryption matters

Most modern phones and many computers encrypt their storage by default. When encryption is on, a factory reset effectively destroys the key that unlocks your data, making the leftover information unreadable. That is why turning on encryption before a wipe is a smart extra step on devices where it is optional.

Older drives

Traditional spinning hard drives are different. A quick erase may leave recoverable traces, so use a full overwrite or a secure erase option. If the drive held sensitive material and you are unsure, physically destroying it or asking a professional recycler about certified data destruction is a reasonable choice.

Common wipe mistakes

• Forgetting to sign out of the cloud account, which can leave the device locked to you.
• Skipping the backup and discovering later that photos were missing.
• Leaving a memory card or SIM inside.
• Not removing the device from your account list afterward.

After the wipe

Log in to your cloud account from another device and remove the old device from your list of trusted devices. Change passwords for especially sensitive accounts if you feel uneasy. If you are donating the device, choose a reputable organization and ask how they handle data.

Finally, take a moment to think about accessories and accounts that tie into the device. Smart home apps, car connections, banking apps, and streaming services may all list the old device as trusted. Removing it from each list prevents confusing sign-in prompts later and keeps strangers from receiving notifications meant for you.

A careful wipe has four parts: back up, sign out, erase, and verify. Take your time, check the result, and you can pass the device along knowing your information stays with you.